org.eclipse.osbp.vaaclipse.addons.app/src/org/eclipse/osbp/vaaclipse/addons/app/Activator.java

/*******************************************************************************
 * Copyright (c) 2012 Rushan R. Gilmullin and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Rushan R. Gilmullin - initial API and implementation
 *     Florian Pirchner - adjustings for osbp implementation
 *******************************************************************************/

package org.eclipse.osbp.vaaclipse.addons.app;

import org.eclipse.osgi.service.datalocation.Location;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;

/**
 * The Class Activator.
 */
public class Activator implements BundleActivator {
	
	/** The context. */
	private BundleContext context;
	
	/** The location tracker. */
	private ServiceTracker<Location, Location> locationTracker;
	
	/** The activator. */
	private static Activator activator;

	/**
	 * Gets the default.
	 *
	 * @return the default
	 */
	public static Activator getDefault() {
		return activator;
	}

	/**
	 * Gets the context.
	 *
	 * @return the context
	 */
	public BundleContext getContext() {
		return context;
	}

	/* (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	@Override
	public void start(BundleContext context) throws Exception {
		activator = this;
		this.context = context;
	}

	/* (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	@Override
	public void stop(BundleContext context) throws Exception {
		VaadinE4Application instance = VaadinE4Application.getInstance();

		if (instance != null)
			instance.shutdown();

		if (locationTracker != null) {
			locationTracker.close();
			locationTracker = null;
		}
	}

	/**
	 * Gets the bundle.
	 *
	 * @return the bundle
	 */
	public Bundle getBundle() {
		if (context == null) {
			return null;
		}
		return context.getBundle();
	}

	/**
	 * Gets the instance location.
	 *
	 * @return the instance Location service
	 */
	public Location getInstanceLocation() {
		if (locationTracker == null) {
			Filter filter = null;
			try {
				filter = context.createFilter(Location.INSTANCE_FILTER);
			} catch (InvalidSyntaxException e) {
				// ignore this. It should never happen as we have tested the
				// above format.
			}
			locationTracker = new ServiceTracker<Location, Location>(context,
					filter, null);
			locationTracker.open();
		}
		return locationTracker.getService();
	}
}